JPS60143963A - Pad type printer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a printing ink supply device having a block fixture and a hollow body, the hollow body being at least temporarily disposed at its ends during operation of the machine. a printing ink supply device that abuts the block; a device for pressing the end face of the hollow body against the block; and a device for producing a relative movement between the block and the hollow body, in which case the hollow body a device whose body is swingably guided about an axis extending substantially parallel to said relative movement, and is pressable against said block coated with printing ink and receives printing ink from a recess in said block to be printed; The present invention relates to a pad type printing machine equipped with a pad for transferring to a separated object.

[Conventional technology and its problems]

In the known machine (DE-C 2 205 430), as mentioned above, in which the hollow body forms a pot that is open on one side only, this pot is mounted on a block. The pot is moved reciprocatingly above the block by a drive. During the outward movement, the block is coated with printing ink, which is also applied to the recesses of the block engraved in the manner of gravure plates and the remaining surface of this block, and during the return movement, the printing ink is applied to the hollow The body leaves the area of the block and a doctor arranged behind this hollow body and movable with it wipes off the excess printing ink from the surface of the block, so that the printing ink is only in the recesses of the block. , from which the printing ink is removed by a pad. After receiving the printing ink from the block, the pad is rocked on the arm to print the object. In machines such as those described above, the edge of the pot also performs some doctoring action, but the block cannot be completely cleaned without an auxiliary doctor. The edges of the pots of known machines are made of a relatively soft material, ie plastic.

The device for pressing the end face of the hollow body against the block has a lever mounted in the machine frame around an upper horizontal pivot axis, this lever being pressed downwards by a spring, the lower end of this lever being , a ring is attached via a horizontal rocking axis extending parallel to the rocking axis,
This ring is fitted onto the hollow body and pressed onto the projecting collar of the hollow body.

The number of printing steps that known machines can perform per hour is limited by the fact that excessive acceleration of the moving parts occurs so that the distance traveled by these moving parts cannot be traveled as quickly as desired. . Furthermore, if the speed of movement is started too high, the more or less liquid or pasty printing ink on the surface of the block causes the doctor to lift up, so that the doctor moves away from the surface of the block, so that the block There is a possibility that it can no longer be wiped clean.

The object of the invention is to create a machine of the type mentioned at the outset, which has an increased operating speed and requires only a small amount of maintenance work compared to known machines.

[Means and effects for solving the problems] According to the present invention, the above problems are solved by the following. That is, the hollow body has a hard material having a hardness of at least 10008 RC (Rockwell C) on at least a part of its end face in the circumferential direction, and is superfinished to have a roughness depth of at most 2 μm, and the hollow body is attached to the block. Apparatus for pressing
The positioning is configured such that the pushing force acts in the immediate vicinity of the contact surface between the block and the hollow body and is distributed at least substantially uniformly in the circumferential direction of the end face, and further the hollow body , is pivotably guided about an axis extending transversely to the relative movement between the block and the hollow body.

The advantages of the invention are as follows. That is, a separate doctor is no longer required since the superfinished part of the end face acts as a doctor itself. The pressing device ensures that even when the relative speed between the block and the hollow body is relatively high, no lifting of the part of the end face acting as a doctor occurs.

When a relative movement occurs between the hollow body and the block due to the application of a pressing force in the immediate vicinity of the contact surface between the block and the hollow body (i.e., in the vicinity of the lower end surface of the hollow body), Good conditions arise which easily prevent a tilting of the hollow body as a result of the frictional forces of. for example,
A pressing force is applied in the immediate vicinity of said contact surface, either by a spring acting on a projection located at the corresponding lower part of the hollow body or by a spring-loaded pin acting on a surface located at the lower part of the hollow body. The fact that it acts on a hollow body is important for preventing tilting, and the difference in leverage appears only slightly compared to structures where the pushing force acts relatively far from the contact surface. Even is important.

In the case of such an inclination, large forces will occur between the end face of the hollow body and the block, whereby there will be a risk of damage. Furthermore, as a result of such an inclination, an impermissibly large gap is created between the block and the hollow body in the region of the end face, through which a disturbing amount of printing ink leaks.

The pressing force is distributed at least approximately evenly around the hollow body, thereby preventing the hollow body from becoming dependent;
The hollow body rests closely against the block everywhere even during relative movements.

In contrast, in the known device as mentioned at the outset, it is not possible to bring the entire end face of the hollow body into intimate contact with the block if the hollow body is provided with a wiping edge made of hard material. Probably. The feature of the invention that the hollow body is guided swingably about two axes makes it possible for the hollow body to rest with its entire end face completely on one block. In this way, the end surface pressed against the block by the pressing device can always be set parallel to the surface of the block.

Since no separate doctor is required, additional space for the doctor is saved and the distance traveled by the moving parts of the machine of the invention is therefore reduced with respect to known machines, thereby increasing the speed of movement. The working speed of the machine, that is, the number of printing steps per unit time, can be increased without this.

Hard substances can be processed with great precision and do not change their shape even over long periods of time, even when printing inks containing components that exert an abrasive effect with a relatively long-term action are used.

The hollow body also does not damage the block, which is mainly formed by stamped or etched steel sheets. Other materials are also possible for the blocks. However, currently plastics (due to their flexibility) and glass (due to their strong friction) are considered unsuitable. As a hard substance,
Particularly hard metals or ceramics are considered. The final shaping of the end face in the region of contact with the block is optimally carried out by lapping in the case of hard materials such as those mentioned above.

The aforementioned hardness of the hard substance is 1ooo Rockwell hardness C
is comparable to the value of Advantageously, very hard materials can be used. The expression "comparable" means
Since Rockwell hardness C is only defined up to a maximum value of 100, it is used here.

If the block or flat as noted in the examples,
The end face of the hollow body is also flat.

The end face may have a cross section similar to that of a known doctor. It is particularly advantageous if the end face rests on the block only in a relatively narrow area, since this facilitates reliable wiping of the printing ink.

In the following, for convenience, it is assumed that the block is moving and the hollow body is fixed, and this also applies to the examples described below. If the end face of the hollow body is configured only in part in the circumferential direction so that it can act as a wiping edge or doctor, said end face part is located on the next side of the hollow body, i.e. the printing ink It is sufficient that on the side on which there is an inked block, the printing ink is removed by a pad after it has been applied and scraped by said end face portion.

That is, in this case, the portion of the end surface that serves as the wiping edge is designed to ensure that the portion of the block that reaches below the area of the pad is cleanly scraped. If other parts of the end face do not provide a very complete seal against the surface of the block, this will probably result in the area of the block located on the other side of the hollow body seen from the pad being somewhat more heavily inked. , where printing ink accumulates over time. Therefore, more frequent leaning is probably necessary in said positions.

Therefore, the entire circumference of the end face of the hollow body acts as a wiping edge, in order to further prevent too much printing ink from getting on one side of the block, which might interrupt the working process for cleaning. The end face of the hollow body is constructed in such a way that the printing ink is prevented from leaking out, if not completely.
Preferably, the blocks are cleaned so frequently that cleaning of the blocks is required at least every few hours. Preferably, the hollow body consists of a hard material or is coated with a hard material over the entire area of its end face.

Here too, the wiping off of printing ink is described as scraping, imitating a known machine.

Preferably, the pressing force is adjustable in order to adapt this force to the respective needs.

The pressing force is related to the size of the contact surface between the hollow body and the block.

In an embodiment of the invention, the hollow body is provided with a contact surface between the block and the hollow body for a movement relative to the casing parallel to the block and the hollow body in a casing receiving the hollow body. is supported by side support members near the. Said support element located in the lower part, ie near the contact surface, keeps small the rotational moments caused by the relative movement which tend to partially move the end face of the hollow body away from the block.

Advantageously, the lateral support for the hollow body is fixedly arranged on the housing.

This feature necessarily entails that the support member is completely independent of the generation of the pressing force acting on the hollow body. This also ensures that the end face of the hollow body rests reliably on the block.

In an embodiment of the invention, the hollow body is pivotably guided by a bearing with a curved surface. Here, for example, spherical bearings are considered, ie bearings having, according to another embodiment of the invention, a ring-shaped support bearing with a spherical inner surface supporting the opposite sides of the hollow body. The expression "ring-shaped" here also includes circular configurations and angular configurations, in particular square configurations. In an embodiment of m, the hollow body has at its lower end an outwardly projecting projection which (in the case of a hollow body with a square cross-section) has a flat facing surface that
or (in the case of a hollow body of circular cross section) forming a rounded support surface supported against a circular cylindrical facing.

In the machine of the invention, the hollow body may be of a single piece. However, in an embodiment of the invention, the hollow body is comprised of a plurality of parts, the parts being movable relative to each other and connected to each other in a liquid-tight manner, and one of the end faces is located at one side of the hollow body. and the other end face is provided in the other part of the hollow body. Embodiments such as those described above make it possible to change the dimensions of the hollow body at the end face, i.e. to reduce the dimensions without requiring the assistance of the manufacturer of the hard metal part or the hard metal coating. Said embodiment facilitates the manufacture of the hollow body as a whole. Said liquid-tight connection between the parts of the hollow body can be effected by bringing these parts into liquid-tight abutment without having to connect these parts firmly or inseparably to each other. It is formed.

Although the hollow body may be formed from more than two parts, it is generally relatively easy to make it from no more than two parts.

In an embodiment of the invention, the hollow body is divided into two parts, each of these parts having a wall, two side walls arranged at right angles to this wall, and a wall. and a ceiling wall extending approximately at right angles to said side walls, the side walls of both parts abutting each other with end faces extending approximately at right angles to the plane of the block. The mutually abutting surfaces of the parts that are movable relative to each other are very precisely flat, particularly smooth and lapped, so that the surfaces lie against each other in a fluid-tight manner. They abut each other to prevent printing ink from leaking from the hollow body. Preferably, both parts are pressed together by spring force. In contrast, in other embodiments of the invention, one of the two parts of the hollow body can be formed by a substantially flat plate.

In other embodiments of the invention, the clamping device is configured such that individual parts of the hollow body are pressed against the block, and in some embodiments each part of the hollow body has its own clamp. It has equipment. This facilitates reliable contact of the individual parts of the end face with the block.

In the various embodiments of the hollow body described, the individual parts of the hollow body are of such rigid construction in the end face region that the hollow body can be considered absolutely solid.

In embodiments of the invention, the front surface may be lightly rounded. This is particularly advantageous when one part of the hollow body is placed on the block with different inclinations.

In embodiments in which the hollow body has a right-angled cross-section, the end face extending parallel to the direction of movement does not have any doctor function, but only has the function of a sealing apron to prevent ink leakage. It seems possible to replace the sealing apron with a flexible part made of metal or plastic without loss of performance.

It must also be taken into account that the blocks are not etched in the region of the sealing apron and are completely smooth.

In an embodiment of the invention, in contrast to the embodiments described below, the hollow body may be accommodated in a conveying device that moves relative to the block, in accordance with known machines.

However, in other embodiments of the invention which have been described repeatedly above, the hollow body is arranged substantially immovably in the machine and is provided with a drive for moving the block.

The latter embodiment is improved in such a way that the block, more precisely the part of the block with the inked and scraped plate area, is in the path traced by the pad during printing of the object to be printed. may be formed. When the printing ink is removed from the block, the pad travels only partially along said path, and after removing the printing ink and when the pad is no longer in contact with the block, the block moves into the hollow body for fresh inking. Moved down, the pad can print said object. In particular, said embodiments:
Suitable for printing objects in production lines or transport lines in difficult-to-reach locations. In this case, the blocks and hollow bodies of a pad-type printing press are connected, for example above the production line, to a sufficiently long connecting rod with which the printing ink is removed from the block. later,
Possibly allowing the pad to be moved downwardly over a considerable distance to print on objects in locations that do not leave room for the entire pad press. especially,
If the print to be produced is of a relatively small area, a few millimeters or centimeters in size, the pad can also be relatively small and light, so even simple structures can be quickly applied. It is movable, so that many printing steps can be performed per unit time. If the printing ink is to be removed from the hollow body without tilting the machine, it can be removed by a suitable arrangement so that the block can be displaced from the hollow body by a lateral movement so that the printing ink can flow downwards. It is possible to remove the Removal of the printing ink from the hollow body without risk of contamination is facilitated by other means of insertion and extraction.

In the case of machines of relatively small dimensions, such as those described by way of example, the filling of the hollow bodies can be used for several hours of machine operation or even for an entire shift (
(approximately 8 hours) is sufficient time, so that there is no absolute need to ensure that printing ink can be additionally filled into the hollow bodies during operation of the machine. However, if necessary, this can be done continuously without difficulty through the opening in the upper part of the hollow body.
Or you can do it regularly.

According to an embodiment of the invention, the block holder (block fixture) holding the block has a length in the direction of the relative movement between the block and the hollow body that is at least twice the length of the printed product to be produced. It is. This allows, on the one hand, according to the embodiment described above, an advantageous removal of the printing ink by the pad, and, on the other hand, it is also possible to refine the machine of the embodiment of the invention as follows. That is, the block holder is configured to hold a plurality of plates, and one plate can be exchanged while another one of the plates completely closes the hollow body, with at least one plate being in the block. In other words, the plate, which has a plate part for receiving printing ink and is not constructed as a block, is superfinished on the side facing the hollow body, depending on the type of block. In this case, the upper sides of both plates are steplessly adjacent to each other and are located on the same plane at least in the contact area.

In the simplest case, in said embodiment of the invention 2
Two plates are provided, namely a block and an unengraved plate, said plates being equal to the blocks in terms of surface quality.

An unengraved plate seals the hollow body while the block is in a position where printing ink can be removed from the block by the pad. At the position of the block,
You can also replace blocks with different blocks.

Especially when the machine is configured so that printing ink is removed from both blocks by multiple pads.
It is obvious that instead of the unengraved plate mentioned above, another block could also be provided. i.e. to seal the hollow body during block exchange,
The engraved block has a J shape as well as the unengraved plate.

In an embodiment of the invention, one of the plates provided for insertion into the block holder is configured as follows. That is, the side of this plate facing the hollow body rests closely against the end face of the hollow body, the plate having an opening through which the printing ink located in the hollow body is led out. Preferably, a container is arranged on the plate, in which the printing ink flowing out from the hollow body is collected, so that any risk of contaminating the machine is prevented.

As mentioned above, it is expedient to open the inlet of the hollow body to allow air to enter in order to drain the printing ink.

The hollow body has a cross-section such that at least in its lower region, ie in the region of the end face of the hollow body, the hollow body completely covers the version of the block. In a machine for a block of a given maximum width, which is limited by the width of the block holder, and a given maximum length, which is limited by the possible movement, the hollow body can be It shall be provided with a cross-section that accommodates the largest possible plate area. However, it is possible to configure the hollow body shorter than the block in the direction of the relative movement between the hollow body and the block, so that it is not at all possible for the block to lie within the cross-section of the end face of the hollow body over its entire length. do not have. Nevertheless, due to the relative movement, the block is inked over its entire length and scraped by the edge of the hollow body, which acts as a doctor.

However, according to an embodiment of the invention, when several hollow bodies are arranged distributed over the width of the block transverse to the direction of relative movement between the block and the hollow bodies;
Due to the relative movement between the block and the hollow body, it is also possible to design the dimensions of the crossed hollow bodies to be smaller than the width of the engraved area. Said embodiment provides that a plurality of relatively small hollow bodies is easier and cheaper to make than a single large hollow body, and that said small hollow bodies are differentiated by the blocks having different tolerance widths. It may be useful because it can be used in a corresponding number of a number of machines.

According to an embodiment of the invention, it may be expedient to arrange at least one of the hollow bodies transposed in the direction of the relative movement between the hollow body and the block.

When several hollow bodies are provided, this gives rise to the possibility of simultaneously inking the blocks with different printing inks.

Other features and advantages of the invention will become apparent from the following detailed description of embodiments of the invention, taken in conjunction with the drawings showing essential details of the invention, and from the claims. The individual features may be realized in the embodiments of the invention either individually or in combination.

〔Example〕

The drawings depict only the details necessary for an understanding of the invention.

The machine 1 is a pad-type printing machine for printing objects with flat and rather uneven surfaces at high speed using a pad 2 made of silicone rubber, and has a base or machine frame 4, in which The other parts of the machine are located there. At the front of the machine 1, located on the left side in FIG. 1, a pad 2 is attached to a guide member 6 that projects forward beyond the other frame 4. More precisely, the pad 2 is mounted on a guide post 8 which is mounted vertically movably within said guide member 6. The guide column 8 is connected to the pad 2 via a support plate 10, to which the lower end of the piston rod 12 of the compressed air piston cylinder unit 14 is attached. Furthermore, a connecting rod 16 is attached to the support plate 1o, which is arranged parallel to the longitudinal direction of the piston cylinder unit 14 and the guide column 8, and the connecting rod has adjusting rings 17 and 18 whose height can be adjusted. These adjustment rings are connected to limit switches (not shown) and serve to adjust the stroke length of the pad 2.

On the side of the frame 1 two mounting plates 19 and 20 are bolted parallel to each other and spaced apart; several upper guide rollers 21 (arranged in a plane) and several lower guide rollers 22 (arranged in a plane parallel to said plane), with said - upper and lower Guide rollers 21 and 2
2 is mounted on the mutually opposing surfaces of the plates 19 and 20. The upper and lower guide rollers 21
and 22, a block holder 24 is movably guided, the block holder 24 having an upper side 25 and a lower side 26 respectively arranged on upper and lower guide rollers 21 and 2.
2 and is guided so as to be able to move strictly in a straight line by the guide rollers. Guidance by the guide rollers is carried out essentially without play. The block holder 24 has an abutment shoulder 28, and a block 30 is supported from below in contact with the abutment shoulder, and this block 30 is held in the above position by a member 32, and the tightening is carried out by the member 32. 32 is attached to the lower surface of the block holder 24 with a screw and acts on the lower surface of the block 30. The tightening element 32 then leaves space for the lower guide roller 22.

The block 30 is made of sheet steel and has a completely flat upper surface 35 which is superfinished by lapping and is provided with a plate which can be produced in particular by photochemical methods, in practice by engraving or etching. There is.

9s3 Behind block 3o in the illustration in Figure 1, and to the right of block 3o in the depiction in Figure 1, play) 4
0 is clamped into the block boulder 24, the upper surface 42 of this plate 40 is completely flat, just like the block 30, and is superfinished by lapping. No plate is attached to the upper surface 42. Said plate 4
0, the tightening seen in FIG. 3 is independent of the member 32;
The clamp, which can be tightened or fixed, is pressed against the abutment shoulder 28 of the block holder 24 by the member.

Therefore, the block 30 and the plate 40 can be fixed to the block holder 24 independently of each other and can be released.

The upper surface 35 of the block 30 and the upper surface 42 of the plate 40 adjoin each other without a seam and lie exactly in the same plane. To ensure this, the block holder 24
The abutment shoulder 28 is machined with sufficient precision.

The block holder 24 with its attached parts is movable by means of a compressed air piston cylinder unit 46, which unit 46 is slid into the frame 4, the bisto rod 47 of this unit 46 being connected to the connection 48. It is connected to a connecting portion 49 connected to the rear of the block holder 24 via. The block holder 24 is movable in the direction of the double arrow 50 by means of the piston cylinder unit 46 .

A vertically extending through hole 52 is provided in the frame 4 and is somewhat widened in its upper end region 54 . In the lower end region of the through-bore 52, a ring 58 is fitted into the recess 56, the radially inward facing surface 60 of which is spherical in longitudinal section; For details, please refer to Figure 2 in particular. Inside the through hole 52 is a circular cylindrical side wall 66.
A hollow body 64 with a central thread 70 is fitted into said side wall 66 and an end wall 68 with a central thread 70 is connected at the top. A tube 72 is screwed into the threaded hole 70 from above and projects beyond the upper surface 74 of the frame 4. The tube 72 is sealed at the top by a releasable screw stopper 76 .

In the lower end region of the hollow body, the side wall 66 of the hollow body 64 is
It has a radially outwardly projecting flange 80 with respect to the remaining outer surface 78 of the side wall, the outer surface 82 of which forms a circular cylindrical surface. Said flange 80
The upper surface 83 of forms an abutment shoulder on which a spring 84, which is designed as a compression spring 4 or a compression helical spring, is supported at its lower end. The upper end of the spring 84 is supported by a shoulder 86 which abuts a high speed stop 88 fitted within the expanded region 54, which fast stop 88 rests on the upper end. The part has a knurl 90 for easier handling, and the insert bone is held in the frame 4 by means of a protrusion 92 depending on the type of part. The diameter of the hole 94 is larger than the outer diameter of the tube 72,
As a result, the high speed stop spigot 88 does not prevent a possible lateral movement of the tube 72 and hence a corresponding movement of the hollow body 64.

In the example, it is assumed that the spring 84 is configured to impart the desired pushing force to the flange 80, without other adjustment possibilities. If adjustment of the pressing force is carried out, this means that instead of the fast stop plug 88, a thread approximately corresponding to the dimensions of said fast stop plug is provided, with the area 54 of the through hole 52 serving as a threaded hole. This is easily possible by configuring Therefore,
The pressing force of the spring 84 can be adjusted by suitable screwing of said screw instead of the fast stop plug 88.

Towards the lower end and below the flange 80, the wall thickness of the hollow body 64 decreases. End face 96 of the thin ring-shaped hollow body 64 that is in contact with the block 30 (see Figure 2a)
, like the upper surface of block 3° and plate 42, is very strictly flat and lapped. The hollow body 6 is shaped so that the end face 96 has remarkable shape stability and wear resistance.
4 is made of hard material in the immediate vicinity of end face 96. In the example, the lower end region of the hollow body 64 is
6 and is formed by a ring 98 made of a hard material, in the example a hard metal, whereas the remaining part of the hollow body 64 is made of steel. The ring 98 is manufactured by sintering and is connected to the remaining hollow body 64 by hard soldering.

Instead of using a separate ring 98 of hard material, in the lower region of the hollow body 64 a suitable coating method, in particular plasma spraying, can be used to coat steel with hard alloys or hard metal oxides. The hollow body 64 may be manufactured, with the required smoothness of the end face 96 here also being produced afterwards by finishing polishing and lapping.

Inside the hollow body 66 is a printing ink 110 filled through a tube 72. Since the lower end face 96 of the hollow body rests very closely against the -L side of the block 30 and is pressed by the compression spring 84, it is impossible for printing ink to leak out. Printing inks contain a relatively high proportion of volatile solvent components.

The distance from the lower end face 96 to the upper face 83 of the flange 80 is approximately half the diameter of the hollow body 96 in the area of the lower end face 96 of the hollow body 66 .

In the plane below the pad 2 and below the block holder 24, which includes the clamping member 32 attached to the block holder 24, the object 115 to be printed, of which only the upper region to be printed is depicted, is be.

The illustrated machine operates as follows.

The block halter 24 is a piston cylinder unit 46
to the front, ie to the left in FIG. 1, until the plate 40 assumes exactly the position taken by the block 30 in FIG. During the moving stroke as described above, the end surface 96 of the hard metal ring 98
wipes excess printing ink from the top surface of the block 30, so that only printing ink remains in the recess in the top surface of the block. The area of the block inked as before is now below pad 2. Compressed air is then supplied to the piston cylinder unit 14 which moves the pad 2 downward and forces it onto the block. Subsequently,
The pad 2 is pulled away from the block again, removing the printing ink from the area of the recess in the block. The block holder 24 is then moved again by the piston cylinder unit 46 to the position depicted in FIG. Subsequently, the pad 2 is moved downwards by the piston-cylinder unit 14 and pressed against the object 115, thereby printing said object. Pad 2 is then lifted again to the position shown in FIG. In FIG. 1, where the object 115 is located, another print is made.

The object is introduced and the previously described movement sequence of the machine is repeated. The position that block 30 assumes when it is ready to remove printing ink by pad 2 is shown in dash-dotted lines in FIG. While the block 30 is in the area below the pad 2, the upper surface of the plate 40 is
4 to prevent printing ink from leaking. The upper surfaces of the block 30 and the plate 40 abut each other in a precise fit also in the region of the contact points of these upper surfaces, so that, apart from the printing ink that is in the recess of the block and is removed by the pad 2, the inner chamber body 64 It is practically impossible for printing ink to leak from the inside.

The pad 2 is made of silicone rubber and is flexibly deformable. The pressing force pushing the pad 2 against the top surface of the block 30 is applied so that the pad is deformed so that it lies flat against the block only in an area large enough to receive printing ink from the area of the engraved block. The purpose is for the two to be close in size. The area of the engraved block expediently has a distance on all sides from the inner border of the end face 96 in the position of the block 30 shown in FIG. This ensures that during the moving movement of the block holder 24, the pad 2 does not pick up the slight traces of printing ink that collect on the edges of the area of the block 30 and the plate 40 that are wiped away by the end face 96. be done. In contrast, in the region located inside the edge region, the block is completely scraped clean.

The hollow body 64 is held in its position by a ring 58 whose spherical inner surface allows a slight rocking movement of the flange 80 about an axis extending parallel to the upper surface of the block, and by a compression spring 84. . Since the compression spring 84 acts on the flange 80 in the region immediately above the block top surface, this advantageously tends to prevent a tilting of the hollow body 64 that would otherwise occur due to the frictional forces occurring during the displacement movement of the block holder 24. This arm exists. Indeed, it must be taken into account that the printing ink used has a certain lubricating and antifriction effect. The possibility of such rocking in the area of the ring 58 and the spring 84
Due to the constant pressing force, the end surface 96 is always in close contact with the upper surface of the block 30 and the upper surface of the plate 40 everywhere.

This provides a seal on all sides.

The pressure which brings the lower end surface 96 into contact with the upper surfaces of the block 30 and the plate 40 is substantially equal in all circumferential areas of the end surface 96. This prevents uneven wear, especially on the top surface of the block. The useful life of the blocks is therefore very long. End face 96 is substantially free of wear.

Owing to the good sealing in the area of the lower end face 96, the printing ink 110 does not have to be removed from the machine when the machine is stopped, even when the machine is stopped over the weekend. When restarting operation, the machine can immediately start printing without any uneconomical or lean work.

When the block has to be replaced, it is only necessary to move the block holder 24 forward, starting from the position shown in FIG. It is said that Block 30 is then replaced. During this time, the hollow body 66
The printing ink 110 leaks from inside the plate 4.
Blocked by 0.

The embodiment shown in FIG. 2b differs from the embodiment shown in FIGS. 1 and 2a in that the hollow body designated by reference numeral 64a is in a lower position than in FIG. 84 in that it has a support surface 83a. A spherical surface 60' corresponding to surface 60 also provides support for hollow body 64a, which is at a lower position than in FIG. In this case, in the embodiment, the support formed by surface 60a is located 6.5 points above the upper surface of the block, and surface 83
a is located above 8I+l+I+ of the top surface of the block.

When the printing ink 110 is removed from the hollow body 64 so that different colors can be printed, for example, the auxiliary unit 120 used in FIG. 4 is utilized.

The auxiliary unit 120 is shown in section perpendicular to the drawing plane of FIG. This auxiliary unit has in its upper region a plate 125 whose dimensions correspond exactly to those of the block 30 and plate 40. Said plate 12
5 has a super finished top surface. printing ink 110
For removal of the block 30 is replaced with the auxiliary unit 120 as described above. After replacing the block holder 24
is again moved to the position shown in Figure 1 and played) 1
A hole 128 disposed in 25 and passing through this plate connects to the interior of the hollow body 64. The screw tap 76 is loosened and air is allowed to flow into the hollow body 64, so that the printing ink 110 flows into a container 130 provided in the auxiliary unit 120 below the plate 125. The top surface of the plate 125 is super-finished like the top surface of the plate 40, and transitions steplessly to the top surface of the plate 40 when the auxiliary unit 120 is installed. container 130
It goes without saying that may be chosen larger than intended in the embodiment. After the printing ink 110 flows out,
In order to clean the interior of the hollow body 64, it is expedient to flush this interior with a solvent through the tube 72.

During the working steps as described above, the hollow body 64 remains in its position. Subsequently, the auxiliary unit 120
can be replaced again by the block 30 or by a different block 30, new printing ink is filled into the hollow body 64, and work can then be continued on said machine.

FIG. 5 shows a hollow body 164 that differs from the embodiment of FIG. The hollow body 164 is completely closed off in the area of the upper end wall 168, in which instead of the tube 72 a rod 173 of solid material is screwed. Like the tube 172, the rod 17
3 serves inter alia for the insertion of the hollow body and for its removal for some maintenance work.

In a machine using a hollow body 164, the end face 9 of the hollow body
It is expedient for the entire machine to be designed to be pivotable so that the machine can be rotated so that 6 points upwards. In said position, the hollow body 164 is removed downwardly from the machine after release of the high-speed stopcock 88 using the rod 173, when printing ink is filled into or removed from the hollow body. In the embodiment as described above, printing ink is then filled into the hollow body 164 while it is outside the machine, and then the hollow body is reinserted into the machine from below.

The removal of the printing ink in the hollow body 164 during a printing ink change takes place in the same way, but in the reverse order. That is, after the machine has been rotated so that the end face 96 faces upwards, the hollow body 164 is removed from the machine downwardly, so that there is no risk of the machine being contaminated with printing ink. There, the printing ink is poured out, the hollow body is emptied and cleaned, and fresh printing ink is supplied and it is reinstalled into the machine.

The hollow bodies 64 and 164 have a circular cylindrical cross section as shown in FIG.

A different structure from FIG. 5 is shown in FIG. In this case, the pressing force of the spring 84 can be adjusted using the screw 188 instead of the high speed stopper 88, as described above. The upper end of the spring 84 is then supported on a screw 188 via an axial ball bearing 190, so that said screw 188 is easily adjustable. In this case, rod 1
73 is not provided. The hollow body 264 is open only in the region of the end face 96 .

The drive for the pad 2 does not necessarily have to be travel limited by the adjustment rings 17 and 18. It is also possible to supply pressure means, in particular compressed air, to the piston-cylinder unit 14, which creates a constant pressure in the piston-cylinder unit 14 during the downward movement of the pad 2.

The stroke limit of the pad 2 is then such that the pad 2 is in contact with the top surface of the block 30 on the one hand and the top surface of the object 115 to be printed on the other hand, with the set pressure and the flexible properties of the silicone rubber. The stroke movement of the pad 2 is limited by being deformed to a desired size in a desired manner in accordance with the movement of the pad 2.

A very nice feature of the illustrated machine is that the block holder 2
4, there is only a small path of travel between the location where the block 30 is inked and the location where the printing ink is removed from the block 3o by the pad 2. Moreover, it is particularly advantageous because it does not require an additional doctor. Because of the small travel distance mentioned above,
In addition, even when the block holder 24 moves at a high speed, the end surface of the hollow body 64 or 164 is always in close contact with the upper surface of the block holder, so the printing machine can obtain a very high printing speed. . However, in the embodiments realized, the drive of block holder 24 and pad 2 is not yet carried out at the highest possible speed.
7000 printing steps per hour were achieved. It is estimated that 1oooo printing steps per hour, or more, can be achieved without difficulty. On the other hand,
With known machines, conventionally only about 2500 printing operations per hour are possible.

In the embodiment, hollow bodies 64 and 164 have an inner diameter of 25 mm.
The internal height of the throat is 90 mm. The width of the lower end face 96 is expediently between 0.1 and 0.5 m, for example 0.3 m. The ring 98 is made of a so-called hard metal, ie a sintered material made of a hard metallic material, which is also used, for example, in cutting tools.

The movement stroke of the block holder 24 is 50 degrees. Other dimensions can be estimated from scale drawings.

The machine 200 shown in FIGS. 8-11 has a first
This machine is different from the machines shown in Figures 7 to 7. The hollow body 202 is mainly formed by two parts 204 and 210, which are connected to each other so as to be movable relative to each other.

The portion 204 has a horizontal cross-section in the shape of a letter 1 except for the uppermost region. This section has a vertical, flat wall 206 followed by side walls 207 and 208 forming the sides of the U and extending approximately at right angles to the wall 2061. side wall 20
The vertical end faces of 7 and 208 are very precisely flat and lapped.

Portion 210 further includes a ceiling wall 209 extending perpendicularly to wall surface 206 and side walls 207 and 208. In their lower end regions, the walls 206, 207 and 208 are tapered and here have a hard metal member 205 tapering further downwards, the lower end face of the hard metal member being a ring of FIG. 2a. Form a wiping edge in the same way as the end face of %. The wiping edge formed by the hard metal member 205 on each wall 206, 207 and 208 extends straight.

Portion 210 is configured to be a substantially mirror image of portion 204. There, a wall surface 212 extending parallel to the wall surface 206 forms a U-shape in horizontal section with the side walls with reference numbers 213 and 214, and in the upper region the ceiling wall 212
5 continues. While the ceiling wall 209 is closed,
The ceiling wall 215 is provided with a threaded hole 216 into which it is possible to screw a screw stopper or, if desired, to attach a hose for continuous or periodic printing ink supply. be.

Side walls 207, 208 and 213, 214 and ceiling wall 20
The vertical end faces of 9 and 215 abut against each other, with the peaks being pressed against each other by the spring bias. The seams between the peaks 204 and 210 are impermeable to printing ink, since the end faces that are in contact with each other are very precisely flat. The threads are connected using a total of four screws 220~2
Guaranteed by 23. Among the screws, screw 220
and 221 are arranged in the lower part of the hollow body 202, so that said screws extend through the side walls 207.208.213.214, while the screws 222 and 223 are arranged in the lower part of the hollow body 202.
At the top of 02, it extends from the side wall through the ceiling wall 209.215 at intervals. Screws 220 - 223 each have a head 224 that forces a coil spring 225 against a shoulder 226 of section 204 , while a threaded portion 228 of the screw engages an internal threaded section that mates with this threaded section in section 210 . match. Screw 2 that works as a set screw
The rotational position of said screws is ensured by a set screw 230 which also prevents 20-223 from being turned too far.

Since the head 224 does not abut the portion 204 in any case, the peak portion 204 can lead to damage and non-sealing.
A highly uneven fixation of and 210 is prevented. The screws 220-223, including the threaded portion 228, lie within the portion 204 with some lateral play, so that the portions 204 and 210 move somewhat along the contact surfaces of said portions relative to each other. be able to. By this, the mountain part 2
04 hard alloy member 205 regardless of manufacturing tolerances,
Accurate abutment against the surface of the flat block 30 is ensured.

Each of the sections 204 and 210 of the hollow body 202 is provided with four holes each extending parallel to the drawing plane of FIG. 8 and at right angles to the drawing plane of FIG. 9 and opening upwardly in FIG. Among the holes, holes 232 are provided in the walls 206 and 212 but near the corners of the rectangular hollow body 202, whereas holes 234 are provided in the side walls 207.
and 208 in close proximity to the interface between image portions 204 and 210. The lower end of hole 232 is placed as deep as possible and is directly above hard metal member 205. Because the longitudinal direction of hole 234 crosses the thread 224 extending through the sidewall, hole 234 is not necessarily as deep as hole 232, as shown in FIG. hole 23
2 and 234, the lower ends of which are connected to the holes 232 and 234.
A rod 238 that presses against the bottom of the housing is fitted from above. Rod 238 does not contact the side walls of holes 232 and 234. The upper end portion of the iron 238 is the bearing portion 24.
0, with the wide head 242 of the rond 238 ensuring that the bearing does not fall downwardly out of the section 240 when the section 240 is removed upwardly. I have to. The bearing has an opposing part 244 above the part 240, and in this opposing part several holes 246 are drilled from below, into each of which a downward force acting on the head 242 is applied. One straining spring 248 is provided in each case. Opposing part 244
Alternatively, said opposing part is secured by a locking rod 252 swingably mounted within the casing 250 so that the bearing is held in that position against the force of the spring 248 against the upper surface of the part 240. The lock bar is held in the locked position by a spring loaded pawl 254. When the mold 254 is swung back, the lock rod 2
52 is swung upwardly, allowing parts 240 and 244 to be removed upwardly together with rod 238. Subsequently, the hollow body 202 is taken out and pulled upward. The correct position of the bearing part 240 is ensured in that the narrow part of this bearing part fits into a cavity 260 with a rectangular cross section that passes through the casing 250 from top to bottom. A cavity 261 passing through the sections 240 and 244 makes it possible to guide the hose into the threaded hole 216 from above.

In plan view, the hollow body 202 is also rectangular, except for some chamfered corners, but has a somewhat less rounded cross-section than the cross-section of the cavity 260, except in the lowermost region. The hollow body 202 has, only in its lowermost region, a protrusion 262 that surrounds the periphery in a ring shape, protrudes outward, and is curved in a convex manner.
It is in exact contact with the wall surface of 0. In the lowermost area of the cavity 260, a member 265 made of hardened steel is fitted into the cavity 260;
is inserted into the casing 250 such that there is a substantially non-wearing, flat support surface opposite the protrusion 262. The hollow body 202 has a cavity 2 above the protrusion 262.
60, this hollow body pivots somewhat within said cavity 260 about two horizontal pivot axes extending perpendicularly and horizontally to the drawing plane of FIG. This allows the wiping edge formed by the hard metal member 205 to always be in a position exactly abutting the surface of the block.

The height of the hollow body seen in Figure 8 is 60 votes when measured from the outside. The maximum width in the area of the protrusion 262 seen in FIG. 8 is 40 mm. The length of the hollow body transverse to the direction of movement of the block, also measured in the area of the protrusion, is 69 cm. The support formed by the protrusion 262 is located 6.5 layers above the top surface 270 of the block. The point of action of the rod 238 in the hole 232 is at about the same height, ie, about 7.5-8 degrees above the top surface 270 of the block.

In contrast, in the bore 234, the point of action of the rod 238 is approximately 13 barrels above the upper surface 270. Other dimensions can be determined from the scale drawing.

Machine 200 differs from machine 1 in that different blocks are used. Moreover, in this case, block 3
0. ! Instead of the nibrate 40, a block 30a having a length corresponding to the total length of this block 30 and plate 40 is used. This allows block 30
There is no need to note an absolutely stepless transition between the surface of the plate 40 and the surface of the plate 40. Thus, during normal operation of the machine, the hard metal part 205 always slides over the absolutely flat and continuous surface of the block 30a.

When replacing block 30a, this block is first moved to the left until it assumes the position shown in dashed lines in FIG.
8 is loosened and the entire block holder is moved further forward, ie to the left in FIG. In this case, a plate 29 whose surface has been very accurately treated and which is connected to the block 30a
2 reaches below the hollow body 202 and seals it while the block 30a is replaced.

FIG. 12 shows, in a schematic view in horizontal section, the position of three hollow bodies 280 with circular cross-section, which are shown in FIG. direction, as well as transversely to this direction, are arranged interchangeably in the housing of other embodiments.

The machine shown is particularly suitable for integrated printing units in high-speed cycle production lines, packaging lines, hotring plants and assembly lines. In this case, the machine is suitable both for printing completely flat objects and for printing objects that are irregularly shaped. The maintenance work carried out on the printing machine requires little time and in practice may involve refilling the printing ink from time to time, for example at the end of a shift, or replacing the block if necessary. In particular, said work is limited. The above-mentioned work can be done even by people who have undergone accelerated training.

Therefore, in the case of automatic production lines, many non-flat parts have to be labeled or dated, where code printing or other printing is necessary, so that the The inventive machine is particularly advantageous. Said task can be carried out without difficulty by the machine of the invention, allowing said printing to be carried out where hitherto it was not possible due to the lack of a suitable machine. From one steel block, the said machine produces 100,000 to 3
00000 prints or more can be produced.

Hard alloys are materials that are also commonly used in the bits of cutting tools. Hard alloys, such as those mentioned above, include hard materials, such as tungsten carbide.

The hardness of hard alloy is Rockwell hardness 1-IRC=16
00 (Rockwell hardness is up to HRC=
(only up to 100 are defined).

Preferably, steel with hardness HRC=64 is used for the block. Regarding the selection of steel, the good sliding properties of the hard alloy on the steel are also important.

If a ceramic is used as hard metal, this ceramic may contain silicon carbide or aluminum oxide.

It has already been mentioned that superfinished surfaces are preferably lapped. In this case a roughness depth of 0.4 μm is achieved. In contrast, the diameter of printing ink pigments is generally 3-4 μm.

In the embodiment of FIG. 8, the total force with which the eight springs press the hollow body 202 against the block is 2QdaN.
(DecaNewton).

Reference numerals in the claims are not limiting, but are intended to facilitate understanding.

〔Effect of the invention〕

The printing press according to the invention has an increased operating speed and requires less maintenance work compared to known machines.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of an embodiment of a pad-type printing machine for printing at a high rate on objects to be printed, Figure 2 is an enlarged view of the part marked ■ in Figure 1, and Figure 2a is the 2 is an enlarged partial view of FIG. 2, FIG. 2b is a diagram showing another embodiment of the part corresponding to FIG. 2a, FIG. 3 is a partially cutaway sectional view in the direction of the arrow ■ in FIG. is a sectional view perpendicular to the plane of FIG. 1 of the printing ink removal device, FIG. 5 is a longitudinal sectional view of a hollow body with an opening on only one side, and FIG. 6 corresponds to the VT-VT line in FIG. 5. 7 is a sectional view showing another embodiment of the clamping device, and FIG. 8 is a sectional view showing another embodiment in which the hollow body is cut along line A-A in FIG. 9. Similarly drawn figures, FIG. 9 is a cross-sectional view corresponding to the line IX-IX in FIG. 8 opened in two different planes, and FIG. 10 is a view of the hollow body in the direction of the arrow X in FIG. 9. 11 is a view of the hollow body in the direction of the arrow M in FIG. 10; FIG. 12 is a schematic representation of the position of several hollow bodies of the machine; FIG. Explanation of symbols (1)...pad type printing machine, +21...pad, +41...frame, (6)...
... Guide member, (8) ... Guide column, (10) ...
Support plate, 021... Piston rod, +141.
・Piston/cylinder unit, (161...connecting rod, (1η, +181...adjustment ring, +19)
, (5))...Mounting on plate, 21+...Upper guide roller, ■...Lower guide roller, 124)...Block holder, (c)...Top surface of block holder, (Ground) ...Block holder lower surface, (28)...Abutting shoulder, (30), (30a)...Block, (32)
...Tightening is done by members, (35)...Top surface of block, (40)...Plate, (42)...Top surface of plate, (46)...Piston/cylinder unit, (47
)...Piston rod, (48)...Connection part, (49
)...Connection part, (50)...Double arrow, (52
)... through hole, (54)... upper end area of through hole,
(56)...Recess, (58)...Ring, (60), (60a)...Inward surface of ring, (64), (64a)...Hollow body, (66 )・・
・Side wall of hollow body, (68)... End wall, (70)... Threaded hole, (
72)...Pipe, (74)...Frame - face, (
76)...Threaded plug, (78)...Outer surface of hollow body, (80)...Flange, (82)...Outer surface of flange, (83)...Top surface of flange, (83a) ...Supporting surface, (84)...Spring, (86)...Shoulder, (88)...High speed stopper, (90)...Knurling, (92)...Protrusion, ' (94)...High-speed stopper hole, (96)...End face of hollow body, (98)...Ring, (110)...Printing ink, (115)...To be printed Object, (120
)... Auxiliary unit, (125)... Auxiliary crab knit plate, (128
)...Auxiliary unit hole, (130)...Container, (164)...Hollow body, (
168)...Upper end wall of hollow body, (172)...Pipe, (173)...Rod, (1
88)... Screw, (190)... Axial ball bearing, (200)... Pad type printing machine, (202)... Hollow body, (204), (210
)...Part, (206), (212)...Wall surface, (207), (208), (213),
(214)...Side wall, (209), (215)
...Ceiling wall, (205)...Hard metal assembly, (216)...Threaded hole, (220), (221), (222), (
223)... Screw, (224)... Screw head, (225)... Coil spring, (226)... Threaded part, (228)... Threaded portion, (230)... Push screw, (232)...hole, (
234) ...hole, (238) ...rod, (
240)...Bearing part, (242)...Rod head, (244)...Opposing part, (246)...
Opposite hole, (248) Spring, (250
)...Casing, (252)...Lock rod, (2
54)...Claw, (260)...Vacancy in casing, (261)...Vacancy in opposing part, (262)...Protrusion, (265)...Support member, (270 )...Block top surface, (280)...Hollow body, (282)...Double arrow, (290)...Mounting screw, (292)...
plate. Patent Applicant Wilfried Philipp Procedural Amendment (
Vinegar) January 28, 1985 1, Indication of the case 1985 Patent Application No. 205478 2, Name of the invention Pad-type printing press 3, Person making the amendment Lembatschstrasse 8 Wilfried Philip Nationality Federal Republic of Germany 4 , Agent Address: 8F Haragpil, 2-9 Kawaramachi, Higashi-ku, Osaka 541 (
06-227-5535) Procedural amendment January 29, 1985 Ministry 1, Indication of case 1988 Patent application No. 2 G5478 2, Name of invention Pad type printing press 3, Person making amendment Heimlenbach Strasse 8 Willfried Philip Nationality: Federal Republic of Germany 4, Agent: 2-9 Kawaramachi, Higashi-ku, Osaka 541
06-227-5535) (1) Specification Self-cleaning Yamanaka, No. 3 submitted on January 28, 1985
On page 3, line 13, the text ``Tighten or fix J'' has been corrected to ``fix or release.'' (2) The following statement is inserted between lines 12 and 13 of page 63 of the same specification, Jozanchu. [[Summary] A printing ink supply device comprising a block fixture, a printing ink supply device having a hollow body, the hollow body at least temporarily abutting the block with its end face during operation of the machine, and the hollow body. a device for pressing an end face of the block against the block; and a device for producing a relative movement between the block and the hollow body, the hollow body moving about an axis extending substantially parallel to the relative movement. Pad-type printing machine with a swingably guided device and a pad pressable against said block coated with printing ink, which receives the printing ink from a recess in this block and transfers it to the object to be printed. , the hollow body has a hardness of at least 1000 HRC (Rockwell C) on at least a portion of the end surface thereof in the circumferential direction. the device for pressing the hollow body against the block, the pressing force acting in close proximity to the contact surface between the block and the hollow body; the hollow body is arranged to be at least substantially uniformly distributed in the circumferential direction of the end face; It is characterized by being guided as possible. This allows high working speeds with low maintenance costs for the solder. ”

Claims (1)

[Scope of Claims] 1. A printing ink supply device comprising: a block fixture; and a printing ink supply device having a hollow body, the hollow body at least temporarily abutting the block with its end face during operation of the machine; a device for pressing an end face of the hollow body against the block; and a device for producing a relative movement between the block and the hollow body, the hollow body having an axis extending substantially parallel to the relative movement. a device movably guided around the block; and a pad pressable against said block coated with printing ink to receive printing ink from a recess in said block and transfer it to the object to be printed. In the pad type printing machine, the hollow body 64.64-1.164.264.202
) has a hard material having a hardness of at least 100 OHRC (Rockwell C) on at least a circumferential portion of its end face (96) and is superfinished to a roughness depth of at most 2 μm, and the hollow body is connected to the block (30 ) is a device (84, 88, 188, 238, 246) for pressing against
The pushing force is configured to act in the immediate vicinity of the contact surface between the block and the hollow body and is distributed at least substantially uniformly in the circumferential direction of the end face, and further the hollow body A pad-type printing machine, characterized in that it is swingably guided around an axis extending transversely to the relative movement between the block and the hollow body. 2. The hollow body (64,641,164,264,20
2) or in a casing receiving this hollow body, the contact between the block and the hollow body for movement relative to the casing parallel to the relative movement between the block and the hollow body; Near the side support member (5
8,265). 3. The side support member for the hollow body (58°26
Machine according to claim 2, characterized in that: 5) is fixedly arranged on the casing (4,250,). 4. The machine according to any one of claims 1 to 3, wherein the hard material is a hard alloy or a ceramic. 5. Machine according to any one of claims 1 to 4, characterized in that the swingable guide is formed by a bearing with a curved surface. 6. Machine according to claim 5, characterized in that the pivotable bearing is formed by a ring-shaped support bearing with a spherical inner surface (6o). 7. The hollow body (202) is movable relative to each other and connected to each other so as not to pass liquid (204°210
), one part of the end face is provided in one part (204) of the hollow body, and the other part of the end face is provided in the other part (210) of the hollow body. A machine according to any one of claims 1 to 6. 8. The hollow body (202) has two parts (204, 21
0), each of said parts having one wall (206, 212), two side walls (207, 208, 213, 214) disposed at right angles to this wall; 1 extending substantially perpendicularly to the wall and said side wall;
and the side wall of the picture portion (204, 210) is connected to the block (30
8. Machine according to claim 7, characterized in that the ends extending substantially perpendicularly to the plane of the two abut each other. 9. The device according to claim 7 or 8, characterized in that the individual parts (204, 210) of the hollow body are pressed against the block (30a) by means of a clamping device. machine. 10. Claim 7, characterized in that each said part of said hollow body has its own clamping device.
The machine according to any one of Items 1 to 9. 11. The clamping device has several rods (238
), and one end of the rod has a spring (24
8), and the other end of the rod is supported by the hollow body (202). The machine according to any one of items 1 to 10. 12. Machine according to claim 7, characterized in that the parts (204, 210) of the hollow body are pressed together by spring force.